Rail for a truck box



FIG. 1 is a front perspective view of my ornamental design of a rail for a truck box;

FIG. 2 is a side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 a front perspective view depicting the rail in position on a truck box which is depicted in broken lines.

The broken lines in the drawings represent unclaimed environment and form no part of the claim. 

CLAIM The ornamental design of a rail for a truck box, as shown and described. 